Specifies how H2O LLM Studio should save the model checkpoints.

When set to **Last** it will always save the last checkpoint, this is the recommended setting.

When set to **Best** it saves the model weights for the epoch exhibiting the best validation metric.
- This setting should be turned on with care as it has the potential to lead to overfitting of the validation data. 
- The default goal should be to attempt to tune models so that the last epoch is the best epoch.  
- Suppose an evident decline for later epochs is observed in logging. In that case, it is usually better to adjust hyperparameters, such as reducing the number of epochs or increasing regularization, instead of turning this setting on.

When set to **Disable** it will not save the checkpoint at all. This can be useful for debugging and experimenting in order to save disk space, but will disable certain functionalities like chatting or pushing to HF.